using static System.Console;
using System.Collections.Generic;
public static class Sorteio {
public static void Main() {
int[] array = { 1, 2, 3, 4 };
array.Shuffle();
foreach (var valor in array) WriteLine(valor);
WriteLine("Soma: {0}", array[0] + array[2]); // soma 1o. e 3o. elemento
//vamos de novo
array.Shuffle(); //com poucos númros tem chance de repetir
WriteLine($"Soma novo sorteio: {array[0] + array[2]}"); // soma 1o. e 3o. elemento
}
}
namespace System.Collections.Generic {
public static class IListExt {
static Random r = new Random(DateTime.Now.Millisecond);
public static void Shuffle<T>(this IList<T> list, int lowerItem, int upperItem) {
upperItem = upperItem > list.Count ? list.Count : upperItem;
lowerItem = lowerItem < 0 ? 0 : lowerItem;
for (int i = lowerItem; i < upperItem; i++) {
int j = r.Next(i, upperItem);
T tmp = list[j];
list[j] = list[i];
list[i] = tmp;
}
}
public static void Shuffle<T>(this IList<T> list, int upperItem) => list.Shuffle(0, upperItem);
public static void Shuffle<T>(this IList<T> list) => list.Shuffle(0, list.Count);
}
}
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